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349 lines
11 KiB
C++
349 lines
11 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include "common/file_util.h"
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#include "core/loader/ncch.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/mem_map.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// NCCH header (Note: "NCCH" appears to be a publically unknown acronym)
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struct NCCH_Header {
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u8 signature[0x100];
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char magic[4];
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u32 content_size;
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u8 partition_id[8];
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u16 maker_code;
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u16 version;
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u8 reserved_0[4];
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u8 program_id[8];
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u8 temp_flag;
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u8 reserved_1[0x2f];
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u8 product_code[0x10];
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u8 extended_header_hash[0x20];
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u32 extended_header_size;
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u8 reserved_2[4];
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u8 flags[8];
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u32 plain_region_offset;
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u32 plain_region_size;
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u8 reserved_3[8];
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u32 exefs_offset;
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u32 exefs_size;
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u32 exefs_hash_region_size;
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u8 reserved_4[4];
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u32 romfs_offset;
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u32 romfs_size;
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u32 romfs_hash_region_size;
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u8 reserved_5[4];
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u8 exefs_super_block_hash[0x20];
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u8 romfs_super_block_hash[0x20];
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// ExeFS (executable file system) headers
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typedef struct {
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char name[8];
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u32 offset;
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u32 size;
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} ExeFs_SectionHeader;
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typedef struct {
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ExeFs_SectionHeader section[8];
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u8 reserved[0x80];
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u8 hashes[8][0x20];
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} ExeFs_Header;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// ExHeader (executable file system header) headers
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struct ExHeader_SystemInfoFlags{
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u8 reserved[5];
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u8 flag;
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u8 remaster_version[2];
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} exheader_systeminfoflags;
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struct ExHeader_CodeSegmentInfo{
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u32 address;
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u32 num_max_pages;
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u32 code_size;
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} exheader_codesegmentinfo;
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struct ExHeader_CodeSetInfo {
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u8 name[8];
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ExHeader_SystemInfoFlags flags;
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ExHeader_CodeSegmentInfo text;
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u8 stacksize[4];
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ExHeader_CodeSegmentInfo ro;
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u8 reserved[4];
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ExHeader_CodeSegmentInfo data;
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u8 bsssize[4];
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};
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struct ExHeader_DependencyList{
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u8 program_id[0x30][8];
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};
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struct ExHeader_SystemInfo{
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u32 save_data_size;
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u8 reserved[4];
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u8 jump_id[8];
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u8 reserved_2[0x30];
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};
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struct ExHeader_StorageInfo{
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u8 ext_save_data_id[8];
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u8 system_save_data_id[8];
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u8 reserved[8];
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u8 access_info[7];
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u8 other_attributes;
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};
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struct ExHeader_ARM11_SystemLocalCaps{
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u8 program_id[8];
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u8 flags[8];
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u8 resource_limit_descriptor[0x10][2];
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ExHeader_StorageInfo storage_info;
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u8 service_access_control[0x20][8];
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u8 reserved[0x1f];
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u8 resource_limit_category;
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};
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struct ExHeader_ARM11_KernelCaps{
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u8 descriptors[28][4];
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u8 reserved[0x10];
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};
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struct ExHeader_ARM9_AccessControl{
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u8 descriptors[15];
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u8 descversion;
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};
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struct ExHeader_Header{
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ExHeader_CodeSetInfo codeset_info;
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ExHeader_DependencyList dependency_list;
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ExHeader_SystemInfo system_info;
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ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps;
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ExHeader_ARM11_KernelCaps arm11_kernel_caps;
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ExHeader_ARM9_AccessControl arm9_access_control;
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struct {
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u8 signature[0x100];
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u8 ncch_public_key_modulus[0x100];
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ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps;
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ExHeader_ARM11_KernelCaps arm11_kernel_caps;
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ExHeader_ARM9_AccessControl arm9_access_control;
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} access_desc;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Loader namespace
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namespace Loader {
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const int kExeFs_MaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
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const int kExeFs_BlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
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/**
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* Get the decompressed size of an LZSS compressed ExeFS file
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* @param buffer Buffer of compressed file
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* @param size Size of compressed buffer
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* @return Size of decompressed buffer
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*/
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u32 LZSS_GetDecompressedSize(u8* buffer, u32 size) {
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u32 offset_size = *(u32*)(buffer + size - 4);
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return offset_size + size;
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}
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/**
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* Decompress ExeFS file (compressed with LZSS)
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* @param compressed Compressed buffer
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* @param compressed_size Size of compressed buffer
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* @param decompressed Decompressed buffer
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* @param decompressed_size Size of decompressed buffer
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* @param error_string String populated with error message on failure
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* @return True on success, otherwise false
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*/
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bool LZSS_Decompress(u8* compressed, u32 compressed_size, u8* decompressed, u32 decompressed_size,
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std::string* error_string) {
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u8* footer = compressed + compressed_size - 8;
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u32 buffer_top_and_bottom = *(u32*)footer;
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u32 i, j;
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u32 out = decompressed_size;
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u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
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u8 control;
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u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
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memset(decompressed, 0, decompressed_size);
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memcpy(decompressed, compressed, compressed_size);
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while(index > stop_index) {
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control = compressed[--index];
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for(i = 0; i < 8; i++) {
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if(index <= stop_index)
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break;
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if(index <= 0)
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break;
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if(out <= 0)
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break;
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if(control & 0x80) {
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if(index < 2) {
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*error_string = "Compression out of bounds";
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return false;
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}
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index -= 2;
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u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
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u32 segment_size = ((segment_offset >> 12) & 15) + 3;
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segment_offset &= 0x0FFF;
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segment_offset += 2;
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if(out < segment_size) {
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*error_string = "Compression out of bounds";
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return false;
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}
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for(j = 0; j < segment_size; j++) {
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u8 data;
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if(out + segment_offset >= decompressed_size) {
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*error_string = "Compression out of bounds";
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return false;
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}
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data = decompressed[out + segment_offset];
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decompressed[--out] = data;
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}
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} else {
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if(out < 1) {
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*error_string = "Compression out of bounds";
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return false;
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}
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decompressed[--out] = compressed[--index];
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}
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control <<= 1;
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}
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}
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return true;
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}
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/**
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* Load a data buffer into memory at the specified address
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* @param addr Address to load memory into
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* @param buffer Buffer of data to load into memory
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* @param size Size of data to load into memory
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* @todo Perhaps move this code somewhere more generic?
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*/
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void LoadBuffer(const u32 addr, const u8* const buffer, const int size) {
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u32 *dst = (u32*)Memory::GetPointer(addr);
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u32 *src = (u32*)buffer;
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int size_aligned = (size + 3) / 4;
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for (int j = 0; j < size_aligned; j++) {
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*dst++ = (*src++);
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}
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return;
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}
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/**
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* Loads an NCCH file (e.g. from a CCI, or the first NCCH in a CXI)
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* @param filename String filename of NCCH file
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* @param error_string Pointer to string to put error message if an error has occurred
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* @todo Move NCSD parsing out of here and create a separate function for loading these
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* @return True on success, otherwise false
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*/
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bool Load_NCCH(std::string& filename, std::string* error_string) {
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INFO_LOG(LOADER, "Loading NCCH file %s...", filename.c_str());
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File::IOFile file(filename, "rb");
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if (file.IsOpen()) {
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NCCH_Header ncch_header;
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file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
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// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
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int ncch_off = 0; // Offset to NCCH header, can be 0 or after NCSD header
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if (memcmp(&ncch_header.magic, "NCSD", 4) == 0) {
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WARN_LOG(LOADER, "Only loading the first (bootable) NCCH within the NCSD file!");
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ncch_off = 0x4000;
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file.Seek(ncch_off, 0);
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file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
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}
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// Verify we are loading the correct file type...
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if (memcmp(&ncch_header.magic, "NCCH", 4) != 0) {
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*error_string = "Invalid NCCH magic number (likely incorrect file type)";
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return false;
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}
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// Read ExHeader
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ExHeader_Header exheader_header;
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file.ReadBytes(&exheader_header, sizeof(ExHeader_Header));
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bool is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
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INFO_LOG(LOADER, "Name: %s", exheader_header.codeset_info.name);
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INFO_LOG(LOADER, "Code compressed: %s", is_compressed ? "yes" : "no");
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// Read ExeFS
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u32 exefs_offset = ncch_header.exefs_offset * kExeFs_BlockSize;
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u32 exefs_size = ncch_header.exefs_size * kExeFs_BlockSize;
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INFO_LOG(LOADER, "ExeFS offset: 0x%08X", exefs_offset);
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INFO_LOG(LOADER, "ExeFS size: 0x%08X", exefs_size);
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ExeFs_Header exefs_header;
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file.Seek(exefs_offset + ncch_off, 0);
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file.ReadBytes(&exefs_header, sizeof(ExeFs_Header));
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// Iterate through the ExeFs archive until we find the .code file...
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for (int i = 0; i < kExeFs_MaxSections; i++) {
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INFO_LOG(LOADER, "ExeFS section %d:", i);
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INFO_LOG(LOADER, " name: %s", exefs_header.section[i].name);
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INFO_LOG(LOADER, " offset: 0x%08X", exefs_header.section[i].offset);
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INFO_LOG(LOADER, " size: 0x%08X", exefs_header.section[i].size);
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// Load the .code section (executable code)...
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if (strcmp((char*) exefs_header.section[i].name, ".code") == 0) {
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file.Seek(exefs_header.section[i].offset + exefs_offset + sizeof(ExeFs_Header) +
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ncch_off, 0);
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u8* buffer = new u8[exefs_header.section[i].size];
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file.ReadBytes(buffer, exefs_header.section[i].size);
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// Load compressed executable...
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if (i == 0 && is_compressed) {
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u32 decompressed_size = LZSS_GetDecompressedSize(buffer,
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exefs_header.section[i].size);
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u8* decompressed_buffer = new u8[decompressed_size];
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if (!LZSS_Decompress(buffer, exefs_header.section[i].size, decompressed_buffer,
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decompressed_size, error_string)) {
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return false;
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}
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// Load .code section into memory...
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LoadBuffer(exheader_header.codeset_info.text.address, decompressed_buffer,
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decompressed_size);
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delete[] decompressed_buffer;
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// Load uncompressed executable...
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} else {
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// Load .code section into memory...
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LoadBuffer(exheader_header.codeset_info.text.address, buffer,
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exefs_header.section[i].size);
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}
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delete[] buffer;
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// Setup kernel emulation to boot .code section...
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Kernel::LoadExec(exheader_header.codeset_info.text.address);
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// No need to load the other files from ExeFS until we do something with them...
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return true;
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}
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}
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}
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return false;
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}
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} // namespace Loader
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